However, nothing is precluding Asobo (except time or knowing it is badly needed) from shipping hundreds of low detailed aircraft of most types, like the ones you’d find in TG or similar products.
What I mean by this is including “Live AI” feature in the simulator requires having the models to represent them all from the get go, otherwise it serves limited purposes.
Furthermore, once there are more 3rd party aircraft, since the simulator has no capability to streaming other aircraft models to other players, it is paramount there is a default bank of most aircraft in service to ensure minimal resemble with the traffic around you.